Patent GB-661858-A (GB)
Title: Improvements in or relating to shuttle-changing mechanisms in looms
IPC: D03D45/34
Filed: 1947-09-11
Abstract: 661,858. Automatic shuttle changing; cop feeler; cutting weft; warp stop motion. ETABLISSEMENT BENNINGER SOC ANON. Sept. 11, 1947 [Sept. 25, 1946], No. 24988/47. Classes 142(i) and 142(iii). In a loom having a change box at one end only, cop feeling and shuttle changing take place at the other end, colour selection and shuttle changing being controlled by the change box motion and by the dobby so as to occur next time the depleted shuttle arrives in the single box. Colour selection. An electromagnet 161, Fig. 26, is moved bodily by the change box motion along a row of armatures 163, one for each cell of the change box. When the cop feeler detects a depleted shuttle, the magnet attracts an armature, thereby releasing a lever 170 from a shoulder 163a to cause closure of a switch 172; the switch is in the circuit of an electromagnet 21, Fig. 6, on the compartment of the shuttle magazine corresponding to the change box cell to which the depleted shuttle belongs. The magnet is not energised, however, until the circuit is completed through switches in the dobby when the depleted shuttle is next picked into the single box; this occurs after two picks if the shuttle remains active but, if the boxes meanwhile change, the circuit is subsequently completed without needing another indication by the cop feeler. Energization of the magnet 21 disengages a pawl 16 from a shoulder 10a of a catch 10 (to which is linked a similar catch at the other side of the magazine), thereby allowing a shuttle supported by a face 10b toturn the catch and fall from the magazine. After shuttle changing, the catch 10 is turned anti-clockwise and locked by the pawl 16; also, the switch 172, Fig. 6, is opened and the arm 170 re-engaged by the armature 163. Opening shuttle box. A bell crank lever 40, Figs. 11 and 12, is normally oscillated idly by a cam 45 about a pivot 39 on a lever 38; when the shuttle changing circuit is completed, an electromagnet 53 engages a pawl 48 with the bell crank lever 40 at a point coinciding with the pivot 38a of the lever 38, to which the bell crank lever is thereby effectively locked; the cam 45 then rocks the lever 38 to release a pawl 34 from a lever 30, an arm 27 on which hooks on to a lever 131 on the slay. As the slay recedes, the lever 131 swings open the shuttle box front 135 and top 135a; also, mechanism (not described) diverts the incoming depleted shuttle behind the shuttle box and subsequently disposes of it down a shoot. Inserting fresh shuttle. The shuttle released from the magazine is inserted into the open shuttle box by a pusher 75, Fig. 18, actuated. by a forked lever 79 operated by a cam 89, bell crank lever 85 and pawl 91 (in the same way as the lever 38 described above, the pawl being rocked by the lever 38, Fig. 11). The fork 77 of the lever 79 can give way against over centre action of a spring 80 in the event of obstruction. Cutting weft. The weft ends are cut by scissors, Fig. 21, comprising a blade 99 pivoted at 97 and a blade 100 pivoted on the blade 99 and having a projection 101 sliding along a slot 102. so that the blades close when the blade 99 is swung to the left. The scissors are normally held open by the pawl 114 engaging a lever 205 linked to the blade 99 by a rod 104. When a fresh shuttle is inserted, a pin 92, Fig. 18, on the lever 79 pushes a pawl 124, Fig. 21, into the path of lever 118, whereupon a cam 122 rocks a lever 111 (as in similar mechanisms described above); a link 110 and cam 108 disengage the pawl 114 from the lever 105, whereupon a spring 128 actuates the scissors to cut the weft of the depleted shuttle. As the slay beats up, a ramp 129 encountering a roller 107 returns the scissors to the position shown but, at this time, the cam 122 still prevents the pawl 114 from reengaging the lever 105; consequently, as the slay recedes, the scissors operate again to cut the weft end of the fresh shuttle. Cop feeler. Depletion of a shuttle is detected by a feeler 54, Fig. 15, described in Specification 655.252. mounted on links 61, 62. When shuttle changing is initiated, the rod 37, Fig. 11, withdraws the feeler to the right, Fig. 15, where it is held clear of the slay by a pawl 70 engaging an arm 68a. As the slide 75. Fig. 18, moves to the right after inserting a shuttle, a nose 94 strikes a nose 95, Fig. 15, on the pawl 70 to allow the feeler to return to its normal position. Warp stop motion. A fallen warp stop motion detector closes a circuit of an electromagnet which causes stoppage of the loom through parts such as 53, 48, 40, 45, 37, Figs. 11 and 12.